<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input type="checkbox" v-model="isAll" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <tr
          is="MyTr"
          v-for="(obj, index) in goodList"
          :key="index"
          :obj="obj"
          @del="delFun"
          :index="index"
        ></tr>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ allPrice }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import MyTr from "./components/ShopCar";
export default {
  components: {
    MyTr,
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  computed: {
    isAll: {
      set(checked) {
        //页面点击复选框,会把选中状态的true/false赋予给v-model绑定的变量
        // 点全选框影响小选框  小选框的状态都在数组里对象的checked属性上存着
        // 只要改掉数组里的对象
        this.goodList.forEach((obj) => (obj.checked = checked)); //同步给所有小选框状态值
      },
      get() {
        return this.goodList.every((obj) => obj.checked); //统计小选框的选中状态
      },
    },
    allPrice() {
      return this.goodList.reduce((sum, obj) => {
        if (obj.checked === true) {
          sum += obj.price * obj.num;
        }
        return sum;
      }, 0);
    },
  },
  methods: {
    delFun(i) {
      this.goodList.splice(i, 1);
    },
  },
};
</script>

<style>
</style>